#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
int strlen(char* str)
{
	int count = 0;
	while (*str != '\0')
	{
		count++;
		str++;
	}
	return count;
}

int main()
{
	char str[] = { "abcdef"};
	int k = strlen(str);
	printf("%d", k);

	return 0;
}